Illuminated hand held motor tool



Aug. 8, 1950 M. JOHNSON ILLUMINATED HAND HELD MOTOR TOOL Filed Aug. 11, 1947 INVENTOR. Moses JomvsoN.

HTI'OP/YEYS.

Patented Aug. 8, 1950- UNITED STATES PATENT OFFICE 3 Claims.

My invention relates to hand-held motor tools, such as buffers and grinders and drills.

It is the object of my invention to provide such a hand-held motor tool with an effective mechanism for lighting the work area and for keeping that work area free of the debris formed by the tool operation.

In carrying out my invention, I provide a handheld casing which at one end is provided with means for mounting a rotatable tool, such as a drill or a grinder or a bufing wheel, either caxial with the casing or offset from the casing axis, as by being at a. right angle thereto; and suitably drive the rotatable tool, conveniently by an electric motor within the hand-held casing; and provide a fan which is mounted on or otherwise driven from the shaft and discharges a stream of air through a nozzle directed at the area on which the tool operates; and provide in connection with the hand-held casing an electric light arranged to direct the light also on the area where the tool is operating, with that lightdirection conveniently obtained by having the air nozzle made of a light-conducting plastic which conducts the light to and discharges it with the air at the work area.

The accompanying drawing illustrates my invention:

Fig. 1 is a plan view of a hand-held motor tool embodying my invention, with some of the parts in section on the line I-l of Fig. 2 and with the axis of the tool proper perpendicular to the axis of the casing; Fig. 2 is a side elevation of the hand-held motor tool of Fig. l, with some parts in section on the line 2-2 of Fig. 1; Fig. 3 is an end elevation of the hand-held motor tool of Figs. 1 and 2, with the plastic nozzle in section; Fig. 4 is a fragmental section showing a modification of the angle-drive gear, somewhat different from that illustrated in Fig. 2; and Fig. 5 is a fragmental elevation showing the hand-held motor tool with a tool co-axial with the casing.

My hand-held motor tool has a casing ID within which an electric motor consisting of a field magnet l l and an armature i2 is axially mounted. The operation of the motor ll-I2 is controlled by a suitable switch, which as shown has two pairs of contacts l3 which are suitably movable by a rotatable end piece I4 of the casing to open and close the circuit for the electric current supplied through the cord I5. The motor armature l2 has a shaft 16 mounted in suitable bearings ll, of which one is shown in Figs. 1 and 2; and that shaft I6 is coaxial with and drivingly connected to the shaft I8 mounted in an end memher Is of the casing l0. As shown, the co-axial shafts l6 and 18 have a separable driving connection between them, separable by the removal of the casing end-member IS.

The shaft I 8 has a driving connection to any suitable tool, such as the drill 20 of Figs. 3 and 5, or a sanding or buffing or grinding disk of Figs. 1 and 2. If such a sanding, buiiing, or grinding disk 2! is used, it is suitably mounted on a shaft or stem 22. The tool, such as the drill 20 or the sanding or grinding or buffing disk 2! with its carrying shaft or stem 22, is desirably removably mounted, as in a suitable chuck 23. The chuck 23 may be coaxial with the shaft 18 and carried directly by it, as is shown in Fig. 5; or may be mounted on its own separate shaft 24 non-coaxial with the shaft I8, as by being at a right angle thereto as illustrated in Figs. 2, 3, and 4. If the chuck 23 is non-coaxial with the shaft 18, as for instance by being at an angle thereto, its shaft 24 is connected to the shaft !8 by any suitable gearing, such for instance as the worm gearing 25 illustrated in Fig. 2 or the bevel gearing 26 illustrated in Fig. 4.

Up to this point the structure of my hand-held motor tool is of known and more or less standard construction.

The casing if! has a laterally offset portion 30 at and near the front end, in which the shaft 18 is mounted; and in that offset portion an electric lamp-bulb 3| is suitably mounted. This lamp-bulb 3! is supplied with current by a cord 32 which branches from the cord l5, and the lamp circuit is controlled by a suitable switch 34 conveniently mounted in the offset casing portion 30.

The end of the offset-portion 39 of the casing receives and supports the mounting end of a nozzle 35, which has an opening through it and is suitably shaped so that its discharge end 36 is directed upon the general area on which the tool 20 or 2! operates. This nozzle may be substan tially straight if the chuck 23 is mounted on and co-axial with the shaft l8, as is shown in Fig. 5; but is suitably bent by about a right angle if the chuck 23 is mounted on its own shaft 24 and has its axis perpendicular to the axis of the shaft l8 and of the casing 10, as is shown in Figs. 1, 2, and 3.

A fan 31 mounted on the shaft I6 draws air in through openings 38 at the rear end of the casing I0, and through the motor ll-l2 by way of air passages provided in known way in such motor, and discharges that air from the main casing body [0 into the offset casing portion 30, and thence into and through the nozzle 35 on to the area where the tool 26 or 2| is working. This discharge of air keeps the Work area clear, by blowing away the debris created by the tool operation.

The nozzle 35 not only discharges air, but has another function of discharging light upon the work area. To this end, the nozzle 35 is made of a light-conducting and light-guiding transparent plastic, such as methyl methacrylate (sold under the trade-mark Lucite). This light-guiding plastic receives the light from the lamp-bulb 3|, and conducts it lengthwise through the nozzle to the nozzle-discharge end 36; which thus discharges both light to illuminate the work area and air to keep that work area clear.

My hand-held motor tool may be used for various purposes, with various tools 20 or 21 mounted in the chuck 23. For instance, it may be used for drilling holes, as with the drill 20; or it may be used to grind or polish various articles, ranging from articles of considerable size down to small articles that are held in the hand, such for instance as dental inlays; or it may be used for buffing callouses, such as corns, as by chiropodists. In all of these uses, and whether the tool is coaxial with or offset from the casing, the nozzle 35 discharges both light and air upon the area being Worked upon, to illuminate that work area and keep it clean.

I claim as my invention:

1. A hand-held motor tool, comprising a casing, an electric motor mounted in said casing, tool-carrying means driven from said motor and mounted with its axis at an angle to the motor axis, a fan driven by said motor, a nozzle receiving air from said fan and discharging air on to the area being Worked on by the tool, said nozzle being curved so that its discharge end is near said work-area, said nozzle being made of a transparent light-conducting and light-guiding 4 plastic, and means mounted in said casing for supporting an electric lamp-bulb behind the said nozzle to supply light thereto.

2. A hand-held motor tool, comprising a casing, a driven shaft rotatably mounted in said casing, tool-carrying means driven by the shaft, a fan driven by said shaft, means carried by said casing fo supporting an electric lamp-bulb, and a nozzle of transparent light-conducting and light-guiding plastic carried by said casing in position to receive air from said fan and light from said lamp-bulb and to discharge both said air and said light on to the area being worked on by the tool.

3. A hand held motor tool, comprising a casing, an electric motor mounted in said casing, tool-carrying means driven by said electric motor, a fan driven by said motor, means carried by said casing for supporting an electric lamp-bulb, and a nozzle of transparent light-conducting and light-guiding plastic carried by said casing in position to receive air from said fan and light from said lamp-bulb and to'discharge both said air and said light on to the area being Worked on by the tool. i

MOSES JOHNSON.

REFERENCES ci'rnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,423,511 Baker July 25, 1922 1,905,633 Feltham Apr. 25, 1933 1,990,035 Kratz et al Feb. 5, 1935 2,310,166 Way Feb. 2, 1943 2,330,592 Kendrick Sept. 28, 1943 2,393,319 Freedman Jan. 22, 1946 

